To tell you the truth, I do not think that looking for a loving relationship because of the loss of family support is at all unhealthy.
First of all, loneliness is THE main reason people seek out traditional relationships in the first place.
Second, it might be a better world if everyone realized that not all lover is perminant love. It iserfectly okay for you to enter into is relationship under the old pagan marriage vow "as long as the love shall last". (as long as everyone knows thia is what's going on).
It may be that your love only lasts until you and they grow past it. Or it might be that it lasts several lifetimes.
But really, your odds of making this work are probably higher becuase you will be more sincerely invested in the first place.
With all my heart I will love and not fail,
With all my soul I will fly and not fall.